Dalu - Baghmara Fm (Miocene of India)

Where: India (25.2° N, 89.3° E: paleocoordinates 16.1° N, 87.3° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Baghmara Formation, Early/Lower Miocene (23.0 - 16.0 Ma)

• STRATIGRAPHIC RELATIONS: Assumed by Hendy (2007) to originate from the Baghmara Fm, which regionally conformably underlies the Chengapara Fm (Burdigalian). AGE: Aquitaian-Burdigalian. STRATIGRAPHIC POSITION: From unknown position within formation

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; poorly lithified, fine-grained, shelly/skeletal marl and lithified, concretionary sandstone

• ENVIRONMENT: Depth of "thirty fathoms", therefore assigned in a relatively shallow water environment.
• SPECIFIC LITHOLOGY: Soft, fine-grained, bluish grey shell marl, and in the intercalatory concretionary sandy hard beds. LITHIFICATION:

Size class: macrofossils

Preservation: original aragonite, original calcite

Collected by Mukerjee in 1924; reposited in the BMNH

• COLLECTORS: P.N. Mukerjee (1924). REPOSITORY: British Museum of Natural History.

Primary reference: P. N. Mukerjee. 1939. Fossil fauna from the Tertiary of Garo Hills, Assam. Palaeontologia Indica 28(1):1-101 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 76574: authorized by Austin Hendy, entered by Austin Hendy on 23.11.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COMPLETENESS: Exhaustive for mollusca (gastropoda, bivalvia, scaphopoda), but not including other groups. NOMENCLATURE: Antiquated nomenclature, but using species resolution asisgnments. Nomenclature may be updated with more recent publications (e.g. Lyngdoh et al., 1999; Harzhauser 2007)
 Nuculanida - Nuculanidae
Nuculana virgo Martin 1879 pointed nut clam
 Arcida - Arcidae
Anadara garoensis n. sp. Mukerjee 1939 ark
Anadara craticulata Nyst 1848 ark
Trisidos tortuosa Linnaeus 1758 clam
 Arcida - Noetiidae
"Barbatia bataviana" = Arcopsis (Arcopsis) bataviana
"Barbatia bataviana" = Arcopsis (Arcopsis) bataviana Martin 1883 clam
SUBSPECIES: B. bataviana carinata
 Pectinida - Pectinoidae
Chlamys jamviniensis Cox 1927 scallop
"Chlamys senatoria" = Mimachlamys senatoria Gmelin 1791 scallop
 Pectinida - Anomiidae
Anomia cf. ephippium Linnaeus 1758 jingle
 Ostreida - Ostreidae
Ostrea latimarginata Vredenburg 1908 oyster
 Ostreida - Pinnidae
"Pinna (Atrina) cf. vexillum" = Pinna vexillum
"Pinna (Atrina) cf. vexillum" = Pinna vexillum Born 1778 oyster
 Solenida - Pharidae
Ensis sp. Schumacher 1817 clam
 Cardiida - Cardiidae
 Cardiida - Tellinidae
Apolymetis grimesi tellin clam
 Cardiida - Mactridae
"Mactra protoreevesii" = Mactra (Mactra) protoreevesii
"Mactra protoreevesii" = Mactra (Mactra) protoreevesii Noetling 1901 clam
 Cardiida - Veneridae
"Dosinia subpenicillata" = Dosina subpenicillata Vredenburg 1928 venus clam
"Clementia papyracea" = Clementia (Clementia) papyracea Gray 1825 venus clam
"Macrocallista erycina" = Costacallista erycina Linnaeaus 1758 venus clam
 Pholadida - Corbulidae
Corbula tunicosulcata Vredenburg 1928 clam
 Lucinida - Lucinidae
Lucina pagana Noetling 1901 clam
 Carditida - Crassatellidae
Eucrassatella rostrata Lamarck 1805 clam
 Heterostropha - Architectonicidae
"Architectonica perspectivum" = Architectonica perspectiva
"Architectonica perspectivum" = Architectonica perspectiva Linnaeus 1767 sundial
 Neotaenioglossa - Calyptraeidae
Calyptraea rugosa Noetling 1895 slipper shell
Calyptraea chinensis Linnaeus 1758 slipper shell
 Cerithioidea - Turritellidae
Turritella noetlingi Vredenburg 1921 turret shell
Turritella pinfoldi Vredenburg 1921 turret shell
Turritella kachhensis Vredenburg 1928 turret shell
SUBSPECIES: T. heberti garoensis
"Turritella (Torculoidella) angulata" = Kapalmerella ranikoti Vredenburg 1928 turret shell
 Sorbeoconcha - Capulidae
Capulus lissus Smith 1894 snail
 Sorbeoconcha - Ranellidae
 Sorbeoconcha - Bursidae
Bursa elegans frog shell
 Sorbeoconcha - Cassidae
 Sorbeoconcha - Cymatiidae
"Gyrineum tuberculatum" = Ranella tubercularis
"Gyrineum tuberculatum" = Ranella tubercularis Risso 1826 snail
 Sorbeoconcha - Ficidae
Ficus conditus Brongniart 1823 fig shell
 Sorbeoconcha - Strombidae
Tibia cf. protofusus Vredenburg 1928 true conch
 Sorbeoconcha - Rostellariidae
"Rimella subrimosa" = Varicospira subrimosa
"Rimella subrimosa" = Varicospira subrimosa d'Orbigny 1852 snail
 Neogastropoda - Olividae
Oliva indica Vredenburg 1925 olive snail
SUBSPECIES: O. (S.) australis indica
Ancilla (Sparella) birmanica Vredenburg 1921 olive snail
 Neogastropoda - Olivellidae
Agaronia pupa Sowerby 1840 snail
SUBSPECIES: O. (A.) nebulosa pupa
 Neogastropoda - Drilliidae
Drillia cf. protointerrupta Noetling 1901 snail
 Neogastropoda - Conidae
"Conus (Leptoconus) vimineus" = Conasprella (Fusiconus) vimineus Reeve 1849 cone shell
Conus (Lithoconus) odengensis Martin 1895 cone shell
Conus (Lithoconus) kyudawonensis Vredenburg 1921 cone shell
Conus (Lithoconus) decollatus Martin 1884 cone shell
Conus (Lithoconus) ineditus Michelotti 1861 cone shell
 Neogastropoda - Terebridae
Terebra (Myurella) protomyuros Noetling 1901 auger snail
 Neogastropoda - Clavatulidae
Turricula promensis Vredenburg 1921 snail
INCLUDES: T. promensis promensis and T. promensis silistrensis
 Neogastropoda - Turridae
Turris (Gemmula) cf. thyrsus Vredenburg 1921 turrid
Clavatula (Perrona) birmanica Vredenburg 1921 turrid
INCLUDES: C (P.) birmanica singuensis and C (P.) birmanica birmanica
 Neogastropoda - Fasciolariidae
 Neogastropoda - Melongenidae
 Neogastropoda - Buccinidae
Siphonalia (Kelletia) subspadicea Vredenburg 1921 true whelk
"Cantharus martinianus" = Cantharus martiniana Noetling 1901 true whelk
Babylonia pangkaensis Martin 1895 true whelk
Babylonia cf. zeylanica Lamarck 1822 true whelk
 Neogastropoda - Nassariidae
Nassarius ovum Martin 1879 snail
 Neogastropoda - Cancellariidae
"Cancellaria (Bivetopsia) dertonensis" = Bivetopsia, Cancellaria cf. birmanica
"Cancellaria (Bivetopsia) dertonensis" = Bivetopsia snail
Cancellaria cf. birmanica Vredenburg 1921 snail
 Neogastropoda - Mitridae
Mitra chinensis Gray 1839 mitre shell
SUBSPECIES: M. chinensis subscrobiculata
 Neogastropoda - Muricidae
Murex (Chicoreus) longanensis Martin 1895 murex snail
 Neogastropoda - Marginellidae
Marginella (Cryptospira) birmanica Vredenburg 1923 margin shell
 Sorbeoconcha - Naticidae